How can we export the opentelemetry metrics to traces spans?

[chandru-kumar]

How can we export the opentelemetry metrics to traces spans? I see metrics example code is instrumenting jvm memory, but not using anywhere like attaching it to Span attributes or exporting to traces. How can we use OpenTelemetry metrics to attach it to Span?

Couldnt understand the usage of metrics with the examples..Can you pls provide us some good exmaples which shows end to end usage of metrics APIs?

[jkwatson]

I'm going to convert this to a discussion, since it's a question, not a bug.

[jkwatson]

Can you explain what you mean by "export metrics to spans"? Can you give an example of what you're asking?

[chandru-kumar]

We were thinking in the aspects of getting applications metrics like jvm memory etc when we do an operation in application..We thought to include a span for an operation and get the resource usage like application's metrics and add it to span..

Ok..Do we have any examples for Metric Exporter? If not so, can you pls include one in examples? It will be helpful and much appreciated..

[jkwatson]

The otlp example includes using the metric exporter. As does the prometheus example. Is there something else you were looking for?

[chandru-kumar]

Ok..I will look into those examples. Thank you!

[itsprakash84]

Hi,

I am looking for Prometheus example, I want to know what are metric by default exported using automatic instrumentation?

I assume we no need to write any code to get Metrics, because in spring boot we just define the below properties rest all taken care.
management.endpoints.web.exposure.include=prometheus

Metrics like

HELP http_server_requests_seconds

TYPE http_server_requests_seconds summary

http_server_requests_seconds_count{exception="None",method="GET",outcome="SUCCESS",status="200",uri="/info",} 5.0
http_server_requests_seconds_sum{exception="None",method="GET",outcome="SUCCESS",status="200",uri="/info",} 0.0294437

http_server_requests_seconds_max{exception="None",method="GET",outcome="SUCCESS",status="200",uri="/info",} 0.0
http_server_requests_seconds_max{exception="None",method="GET",outcome="SUCCESS",status="200",uri="/metrics",} 0.0048482

jvm_memory_used_bytes

system_cpu_usage 0.0019443244730260306
5)
Tomcat metrics
tomcat_threads_busy_threads

[jkwatson]

I don't know that the auto-instrumentation provides any metrics at this point. That's a question for the opentelemetry-java-instrumentation project, though.